Eruptive Stars


Recurrent Symbiotic Nova T CrB
(Pre Outburst spectroscopic monitoring: 2022 - 202X)





Context T CrB belongs to the very small group of recurring novae (RN) and among them the symbiotic sub-group (SyRN).
Its first outburst was detected in 1866 during which Huggins obtained the first spectrum of a nova. The second outburst occurred in 1946, making T CrB a recurring nova.
The system is currently in high state since (increase of the accretion rate toward the disk and the boundary layer)
From a comparison with 1946 event, Brad Sheafer (2019) predicted the next outburst around 2023. But Luna+ (2020) considering the lower activity of the current high state delayed the previson to 2023-2026.
B. Sheafer (2023) revised the previson to. 2025.5 +/- 1.3
L+ : Luna+,2020
B : Sheafer, 2019, 2023
L+: Luna & al. (20202)
B: Brad Sheafer (2019,2023)
blue dot: periastron (B. Sheafer suggests that the outburst could coincide.
triangle: current date
Eruptive Stars Database
Topic in ARAS Forum


Last Spectrum





Current cycle in dark

The B and V magnitudes (significantly dependant of the luminosity of the hot component) reach the pre high state level.



One of the key feature of the evolution of the sytem during the high state pre-outburst phase is the intensity of He II 4686 line (see e.g. Ielkiewicz+, 2016)

The last spectra show the fast decrease of He II at a time scale of about one month.




Orbital Phase: Lines, 1988













Spectra T CrB Eruptive Stars Database:


Schaefer, B. E, MNRAS, 2023
Schaefer, B. E, AAS, 2019
Luna, G.J.M, Sokoloski J.L., Mukai K., and Kuin, N.P.M, 2020, ApJ
Iłkiewicz, K., Mikołajewska, J., Stoyanov, K., Manousakis, A., Miszalski, B., MNRAS, 2016